Co5.57Fe1.62Ni1.81S8 nanocomposite hybridized with reduced graphene oxide (Co5.57Fe1.62Ni1.81S8/rGO) was prepared through a one-step hydrothermal method. The hybrid was characterized by XRD, EDX, FESEM and HRTEM. The electrochemical hydrogen evolution behavior of nanohybrids with different mass ratios was studied as modified glassy carbon electrodes by linear sweep voltammetry, chronopotentiometry and electrochemical impedance spectroscopy. The results showed overpotential in 10 mA/cm(2) ( -100 mV) for Co5.57Fe1.62Ni1.81S8/rGO (1 g:0.5 g) among all nanohybrids. Also, the obtained Tafel slope (53.6 mV/dec) confirmed the Volmer-Heyrovsky mechanism for HER. The electro-catalytic properties for HER of Co5.57Fe1.62Ni1.81S8/rGO (1g:0.5 g) were compared with some transition metal dichalcogenide based composites.